------------[ cut here ]------------
kernel BUG at fs/buffer.c:553!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 9509 Comm: syz-executor.1 Not tainted 4.19.77 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:mark_buffer_dirty_inode fs/buffer.c:553 [inline]
RIP: 0010:mark_buffer_dirty_inode+0x30f/0x410 fs/buffer.c:544
Code: 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 75 4d 4c 89 63 58 4c 89 ef e8 2b 63 3b 05 e9 ee fd ff ff e8 61 79 b2 ff <0f> 0b 4c 89 ff e8 97 0e e9 ff e9 d3 fd ff ff e8 8d 0e e9 ff e9 5b
RSP: 0018:ffff888096997a70 EFLAGS: 00010246
RAX: 0000000000040000 RBX: ffff88807f433e70 RCX: ffffc90005ae6000
RDX: 0000000000040000 RSI: ffffffff81b900df RDI: ffff88803d935470
RBP: ffff888096997ab0 R08: ffff888056208600 R09: 0000000000000003
R10: ffffed1015d24732 R11: ffff8880ae923993 R12: ffff88803d935310
R13: 0000000000000000 R14: ffff88808fb05598 R15: ffff888096997d58
FS:  00007fc7ef130700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000001abb7b0 CR3: 0000000096a41000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 fat16_ent_put+0xd2/0x110 fs/fat/fatent.c:182
 fat_alloc_clusters+0x628/0xf20 fs/fat/fatent.c:500
 fat_add_cluster+0x6f/0x100 fs/fat/inode.c:101
 fat_fallocate+0x28a/0x330 fs/fat/file.c:300
 vfs_fallocate+0x4aa/0x9d0 fs/open.c:308
 ksys_fallocate+0x58/0xa0 fs/open.c:331
 __do_sys_fallocate fs/open.c:339 [inline]
 __se_sys_fallocate fs/open.c:337 [inline]
 __x64_sys_fallocate+0x97/0xf0 fs/open.c:337
 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459a59
Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fc7ef12fc78 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000459a59
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000004
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000369e5d84 R11: 0000000000000246 R12: 00007fc7ef1306d4
R13: 00000000004c01d6 R14: 00000000004d2610 R15: 00000000ffffffff
Modules linked in:
kauditd_printk_skb: 1 callbacks suppressed
audit: type=1400 audit(1570399571.147:100): avc:  denied  { map } for  pid=9524 comm="syz-executor.5" path="/" dev="sda1" ino=2 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=dir permissive=1
kobject: 'loop1' (000000005c08ad17): kobject_uevent_env
---[ end trace 4d3fe7ceca46ed19 ]---
kobject: 'loop1' (000000005c08ad17): fill_kobj_path: path = '/devices/virtual/block/loop1'
RIP: 0010:mark_buffer_dirty_inode fs/buffer.c:553 [inline]
RIP: 0010:mark_buffer_dirty_inode+0x30f/0x410 fs/buffer.c:544
kobject: 'loop2' (0000000018edbe24): kobject_uevent_env
kobject: 'kvm' (000000000ff6cb5d): kobject_uevent_env
Code: 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 75 4d 4c 89 63 58 4c 89 ef e8 2b 63 3b 05 e9 ee fd ff ff e8 61 79 b2 ff <0f> 0b 4c 89 ff e8 97 0e e9 ff e9 d3 fd ff ff e8 8d 0e e9 ff e9 5b
kobject: 'kvm' (000000000ff6cb5d): fill_kobj_path: path = '/devices/virtual/misc/kvm'
kobject: 'loop2' (0000000018edbe24): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'kvm' (000000000ff6cb5d): kobject_uevent_env
kobject: 'kvm' (000000000ff6cb5d): fill_kobj_path: path = '/devices/virtual/misc/kvm'
kobject: 'loop5' (000000006289113b): kobject_uevent_env
kobject: 'loop5' (000000006289113b): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop3' (0000000043975390): kobject_uevent_env
RSP: 0018:ffff888096997a70 EFLAGS: 00010246
kobject: 'loop3' (0000000043975390): fill_kobj_path: path = '/devices/virtual/block/loop3'
RAX: 0000000000040000 RBX: ffff88807f433e70 RCX: ffffc90005ae6000
kobject: 'loop2' (0000000018edbe24): kobject_uevent_env
RDX: 0000000000040000 RSI: ffffffff81b900df RDI: ffff88803d935470
kobject: 'kvm' (000000000ff6cb5d): kobject_uevent_env
kobject: 'kvm' (000000000ff6cb5d): fill_kobj_path: path = '/devices/virtual/misc/kvm'
kobject: 'loop2' (0000000018edbe24): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'kvm' (000000000ff6cb5d): kobject_uevent_env
RBP: ffff888096997ab0 R08: ffff888056208600 R09: 0000000000000003
R10: ffffed1015d24732 R11: ffff8880ae923993 R12: ffff88803d935310
kobject: 'kvm' (000000000ff6cb5d): fill_kobj_path: path = '/devices/virtual/misc/kvm'
R13: 0000000000000000 R14: ffff88808fb05598 R15: ffff888096997d58
FS:  00007fc7ef130700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
kobject: 'rx-0' (00000000c9560d57): kobject_cleanup, parent 00000000e7dd9667
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
kobject: 'rx-0' (00000000c9560d57): auto cleanup 'remove' event
CR2: 0000000001adf660 CR3: 0000000096a41000 CR4: 00000000001426e0
kobject: 'rx-0' (00000000c9560d57): kobject_uevent_env
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
kobject: 'rx-0' (00000000c9560d57): kobject_uevent_env: uevent_suppress caused the event to drop!
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
kobject: 'rx-0' (00000000c9560d57): auto cleanup kobject_del